y we need to pay tax again and again????

phanindar (Student CA IPC / IPCC) (25 Points)

09 October 2018  
..why we need to pay tax again n again !!!!??!!!!
for example
if I want to buy car including GST rate it has same value
GST on petrol
road tax
green tax

Y should we pay tax again and again?????
plz clarify my doubt